package com.bwie.bwedu.ui;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

import com.bwie.bwedu.R;

public class ClearEditText extends EditText implements View.OnFocusChangeListener,TextWatcher{

	 //删除按钮的引用
    private Drawable mClearDrawable;

    //控件是否有焦点
    private boolean hasFoucs;
    
	public ClearEditText(Context context) {
		this(context, null);
	}

	public ClearEditText(Context context, AttributeSet attrs) {
		// 这里构造方法也很重要，不加这个很多属性不能再XML里面定义
		this(context, attrs, android.R.attr.editTextStyle);
	}

	public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	 private void init() {
	        //获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
	        mClearDrawable = getCompoundDrawables()[2];
	        if (mClearDrawable == null) {
	        	// throw new NullPointerException("You can add drawableRight attribute in XML");
	            mClearDrawable = getResources().getDrawable(R.drawable.selector_ic_delete);
	        }

	        //getIntrinsicWidth()取得的是Drawable在手机上的宽度，所以不同分辨率下获取到的值是不同的，关键所在处
	        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());

	        //默认设置隐藏图标
	        setClearIconVisible(false);
	        //设置焦点改变的监听
	        setOnFocusChangeListener(this);
	        //设置输入框里面内容发生改变的监听
	        addTextChangedListener(this);
	    }

	    /**
	     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
	     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
	     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向就没有考虑
	     */
	    @Override
	    public boolean onTouchEvent(MotionEvent event) {
	        if (event.getAction() == MotionEvent.ACTION_UP) {
	            if (getCompoundDrawables()[2] != null) {

	                boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
	                        && (event.getX() < ((getWidth() - getPaddingRight())));

	                if (touchable) {
	                    this.setText("");
	                }
	            }
	        }

	        return super.onTouchEvent(event);
	    }

	    /**
	     * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
	     */
	    @Override
	    public void onFocusChange(View v, boolean hasFocus) {
	        this.hasFoucs = hasFocus;
	        if (hasFocus) {
	            setClearIconVisible(getText().length() > 0);
	        } else {
	            setClearIconVisible(false);
	        }
	    }


	    /**
	     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
	     * @param visible
	     */
	    protected void setClearIconVisible(boolean visible) {
	        Drawable right = visible ? mClearDrawable : null;
	        setCompoundDrawables(getCompoundDrawables()[0],
	                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
	    }


	    /**
	     * 当输入框里面内容发生变化的时候回调的方法
	     */
	    @Override
	    public void onTextChanged(CharSequence s, int start, int count,int after) {
	        if(hasFoucs){
	            setClearIconVisible(s.length() > 0);
	        }
	    }

	    @Override
	    public void beforeTextChanged(CharSequence s, int start, int count,int after) {

	    }

	    @Override
	    public void afterTextChanged(Editable s) {

	    }


	    /**
	     * 设置晃动动画
	     */
	    public void setShakeAnimation(){
	        this.setAnimation(shakeAnimation(5));
	    }

	    /**
	     * 晃动动画
	     * @param counts 1秒钟晃动多少下
	     * @return
	     */
	    public static Animation shakeAnimation(int counts){
	        Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
	        translateAnimation.setInterpolator(new CycleInterpolator(counts));
	        translateAnimation.setDuration(1000);
	        return translateAnimation;
	    }
}
